Orthodox Church also has some canon laws.Is there any difference between the Canon law of Orthodox and Catholic?
Yes. Different canons.
Catholic and Orthodox also have Canon law.Why is Catholic legalistic while Orthodoxy is not?
Because the Latins in the West - the Romans - were the masters of the law, much more so than the Greeks. Thus, in the Eastern Roman Empire, where Greek was spoken, law school was entirely in Latin up until the 7th century. The 6th century Byzantine Emperor Justinian wrote his big civil code - the Corpus Juris Civilis - not in Greek, which the majority of his subjects spoke, but in Latin, because that was the language of the great jurists, such as for example Ulpian.
Virgil, the great Roman poet, once wrote (Aeneid, VI:847-852):
Others (I can well believe) will hammer out bronze that breathes
with more delicacy than us, draw out living features
from the marble: plead their causes better, trace with instruments
the movement of the skies, and tell the rising of the constellations:
remember, Roman, it is for you to rule the nations with your power,that will be your skill - to crown peace with law.
Thus you can see how legalism would sooner develop in the Latin west than in the Greek east. Hope this helps.